Plants require which of the following atmospheric gases to produce sugars through photosynthesis?

Nitrogen is an essential nutrient for plants, primarily involved in the synthesis of amino acids and proteins. However, it is not directly utilized in the process of photosynthesis for sugar production. Plants uptake nitrogen in the form of nitrates or ammonium from the soil, but it does not play a role in converting atmospheric gases into sugars.

Oxygen is a byproduct of photosynthesis, produced when plants convert carbon dioxide and water into glucose. While oxygen is vital for respiration in many organisms, it is not a gas that plants require to produce sugars; rather, it is released into the atmosphere as a result of the photosynthetic process.

Helium is an inert gas and does not participate in any biological processes, including photosynthesis. It does not contribute to the production of sugars or any other metabolic functions in plants. Therefore, while helium is a gas, it is not required for photosynthesis.